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Finding the Fourth Proportional to 9.99, 14.99 and 9.87

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Solution

The fourth proportional to 9.99, 14.99 and 9.87 is: 14.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.99 : 14.99 = 9.87 : x
  2. Step 2: Convert to fraction form
    9.99/14.99 = 9.87/x
  3. Step 3: Cross multiply
    9.99x = 14.99 × 9.87
  4. Step 4: Simplify right side
    9.99x = 147.88
  5. Step 5: Solve for x
    x = 147.88/9.99
  6. Step 6: Final answer
    x = 14.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.